Synthesis, characterization and evaluation of amphoteric chitosan-based grafting flocculants for removing contaminants with opposite surface charges from oilfield wastewater

2017 ◽  
Vol 93 (4) ◽  
pp. 968-974 ◽  
Author(s):  
Shuanglei Peng ◽  
Guancheng Jiang ◽  
Xinliang Li ◽  
Lili Yang ◽  
Fan Liu ◽  
...  
Keyword(s):  
Surface Charges ◽  
Opposite Surface

One step prepared Janus acid-resistant nanofiltration membranes with opposite surface charges for acidic wastewater treatment

2020 ◽  
Vol 250 ◽  
pp. 117245
Author(s):  
Ling Yu ◽  
Yong Zhang ◽  
Lili Xu ◽  
Qinyi Liu ◽  
Baoleerhu Borjigin ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Surface Charges ◽  
Nanofiltration Membranes ◽  
Opposite Surface ◽  
One Step ◽  
Acidic Wastewater

scholarly journals Interaction between Polymer Microspheres with Opposite Surface Charges in the Non-Aqueous System.

1993 ◽  
Vol 50 (5) ◽  
pp. 369-373
Author(s):  
Yasushi NAKAO ◽  
Takeshi TANAKA ◽  
Motoshi YABUTA ◽  
Akira TOMINAGA
Keyword(s):  
Aqueous System ◽  
Polymer Microspheres ◽  
Surface Charges ◽  
Opposite Surface

Dipolar Janus liposomes: formation, electrokinetic motion and self-assembly

Soft Matter ◽  
2020 ◽  
Vol 16 (9) ◽  
pp. 2177-2184 ◽  
Author(s):  
Zening Liu ◽  
Jinyan Cui ◽  
Wei Zhan
Keyword(s):  
Self Assembly ◽  
Janus Particles ◽  
Surface Charges ◽  
First Report ◽  
Microscopic Evidence ◽  
Opposite Surface ◽  
Assembly Behavior ◽  
Electrokinetic Motion

Presented herein is the first report on dipolar Janus liposomes – liposomes that contain opposite surface charges decorating the two hemispheres of the same colloidal body. Microscopic evidence is given in regard to the formation, electrokinetic motion as well as electrostatic self-assembly behavior of these new Janus particles.

Self-supporting porous carbon nanofibers with opposite surface charges for high-performance inverted capacitive deionization

Desalination ◽  
2021 ◽  
Vol 520 ◽  
pp. 115340 ◽  
Author(s):  
Pengfei Nie ◽  
Shiping Wang ◽  
Xiaohong Shang ◽  
Bin Hu ◽  
Manhong Huang ◽  
...  
Keyword(s):  
Carbon Nanofibers ◽  
Porous Carbon ◽  
High Performance ◽  
Capacitive Deionization ◽  
Surface Charges ◽  
Opposite Surface

ELECTROHYDRODYNAMIC INSTABILITY OF LIQUID SHEET SATURATING POROUS MEDIUM WITH INTERFACIAL SURFACE CHARGES

2013 ◽  
Vol 23 (2) ◽  
pp. 165-191
Author(s):  
Mohamed F. El-Sayed ◽  
M. H. M. Moussa ◽  
Ahmed A. A. Hassan ◽  
N. M. Hafez
Keyword(s):  
Porous Medium ◽  
Liquid Sheet ◽  
Surface Charges ◽  
Electrohydrodynamic Instability ◽  
Interfacial Surface

Preparation of TiO2 Nano-particles with Controllable Surface Charges for Electrophoretic Display

2012 ◽  
Vol 27 (6) ◽  
pp. 649-654 ◽  
Author(s):  
Zhi-Jie LIU ◽  
Xiang-Gao LI ◽  
Shi-Rong WANG
Keyword(s):  
Nano Particles ◽  
Surface Charges ◽  
Electrophoretic Display

Carboxymethyl-hexanoyl Chitosan Nanodroplets for Ultrasonic Imaging and Drug Delivery to Tumor

2018 ◽  
Vol 24 (15) ◽  
pp. 1682-1688 ◽  
Author(s):  
Yu Jinsui ◽  
Situ Bing ◽  
Luo Muhua ◽  
Li Yue ◽  
Liao Jianyi ◽  
...  
Keyword(s):  
Ultrasound Imaging ◽  
Tumor Therapy ◽  
Carboxymethyl Chitosan ◽  
Great Promise ◽  
Ovarian Cancer Cells ◽  
Mechanical Index ◽  
Surface Charges ◽  
Particle Structure ◽  
Drug Release Profile ◽  
Hexanoyl Chitosan

Introduction: Although a great many strategies have been proposed for tumor-targeted chemotherapy, current delivery methods of anticancer drugs present limited success with inevitable systemic toxicity. The aim of this study was to develop a new kind of theranostic carrier for targeted tumor therapy. Methods: Prior to prepare CHC-PFP-DOX, carboxymethyl-hexanoyl chitosan (CHC) was synthesized by acylation of carboxymethyl chitosan. To develop CHC-PFP, perfluoropentane (PFP), an ultrasound gas precursor, was simultaneously encapsulated into the hydrophobic inner cores of pre-formulated CHC micelle in aqueous phase via using the oil in water (O/W) emulsion method. The size distribution and surface charges of these nanodroplets were measured and the morphology was observed by transmission electron microscopy (TEM). For ultrasound imaging application, in vitro model was established to evaluate the imaging of CHC-PFP-DOX under different concentration and mechanical index. After that, the anti-tumor effect of ultrasound combined with CHC-PFPDOX on ovarian cancer cells was investigated. Results: The resulting CHC-PFP-DOX had a nano-sized particle structure, with hydrophobic anticancer DOX/PFP inner cores and a hydrophilic carboxymethyl chitosan polymer outer shell. The favorable nano-scaled size offers the potential to extravagate from veins and accumulate in tumor tissues via enhanced permeation and retention (EPR) effect. Additionally, CHC-PFP-DOX showed the ability to serve as ultrasound imaging agent at body temperature. Notably, it exhibited an ultrasound-triggered drug release profile through the external ultrasound irradiation. Further study demonstrated that ultrasound combined with CHC-PFP-DOX can improve the killing effect of chemotherapy for tumor. Conclusion: CHC-PFP-DOX holds great promise in simultaneous cancer-targeting ultrasound imaging and ultrasound- mediated delivery for cancer chemotherapy.

Evaluation of Surface-modified Superparamagnetic Iron Oxide Nanoparticles to Optimize Bacterial Immobilization for Bio-separation with the Least Inhibitory Effect on Microorganism Activity

2020 ◽  
Vol 10 (2) ◽  
pp. 166-174
Author(s):  
Mehdi Khoshneviszadeh ◽  
Sarah Zargarnezhad ◽  
Younes Ghasemi ◽  
Ahmad Gholami
Keyword(s):  
Iron Oxide ◽  
Amino Acid ◽  
Magnetic Nanoparticles ◽  
Iron Oxide Nanoparticles ◽  
Surface Coating ◽  
Superparamagnetic Iron Oxide ◽  
Superparamagnetic Iron Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
Surface Charges ◽  
Surface Modified

Background: Magnetic cell immobilization has been introduced as a novel, facile and highly efficient approach for cell separation. A stable attachment between bacterial cell wall with superparamagnetic iron oxide nanoparticles (SPIONs) would enable the microorganisms to be affected by an outer magnetic field. At high concentrations, SPIONs produce reactive oxygen species in cytoplasm, which induce apoptosis or necrosis in microorganisms. Choosing a proper surface coating could cover the defects and increase the efficiency. Methods: In this study, asparagine, APTES, lipo-amino acid and PEG surface modified SPIONs was synthesized by co-precipitation method and characterized by FTIR, TEM, VSM, XRD, DLS techniques. Then, their protective effects against four Gram-positive and Gram-negative bacterial strains including Enterococcus faecalis, Staphylococcus aureus, Escherichia coli and Pseudomonas aeruginosa were examined through microdilution broth and compared to naked SPION. Results: The evaluation of characterization results showed that functionalization of magnetic nanoparticles could change their MS value, size and surface charges. Also, the microbial analysis revealed that lipo-amino acid coated magnetic nanoparticles has the least adverse effect on microbial strain among tested SPIONs. Conclusion: This study showed lipo-amino acid could be considered as the most protective and even promotive surface coating, which is explained by its optimizing effect on cell penetration and negligible reductive effects on magnetic properties of SPIONs. lipo-amino acid coated magnetic nanoparticles could be used in microbial biotechnology and industrial microbiology.

Varying the Surface Charges of Gold Nanoparticles in Span 80, AOT, and Span 80 + AOT Micellar Systems in n-Decane

2020 ◽  
Vol 94 (11) ◽  
pp. 2291-2298
Author(s):  
E. V. Poleeva ◽  
A. T. Arymbaeva ◽  
A. I. Bulavchenko
Keyword(s):  
Gold Nanoparticles ◽  
Surface Charges ◽  
Micellar Systems ◽  
Span 80
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